516664999 has 4 divisors (see below), whose sum is σ = 517128664. Its totient is φ = 516201336.

The previous prime is 516664961. The next prime is 516665011. The reversal of 516664999 is 999466615.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 516664999 - 2⁹ = 516664487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516664399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230157 + ... + 232390.

It is an arithmetic number, because the mean of its divisors is an integer number (129282166).

Almost surely, 2^516664999 is an apocalyptic number.

516664999 is a deficient number, since it is larger than the sum of its proper divisors (463665).

516664999 is a wasteful number, since it uses less digits than its factorization.

516664999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463664.

The product of its digits is 3149280, while the sum is 55.

The square root of 516664999 is about 22730.2661445043. The cubic root of 516664999 is about 802.4223448828.

It can be divided in two parts, 51666 and 4999, that added together give a palindrome (56665).

The spelling of 516664999 in words is "five hundred sixteen million, six hundred sixty-four thousand, nine hundred ninety-nine".